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J. H. BROW'N. Button-"Hole- Sewing-Machine No. 225,559. Patented Mar. 16, I880.

- NJEYERS, PHDTO'LITHOGRAPNER. WASHINGTON. 04C.

UNITED STATES PATENT OFFICE.

JOHN H. BROWN, OF BROOKLYN, NEW YORK.

BUTTON-HOLE SEWING-MACHINE.

SPECIFICATION formingpart of Letters Patent No. 225,559, dated March 16, 1880.

Application filed November 11, 1879. I

To all whom it may concern Be it known that 1, JOHN H. BROWN, of Brooklyn, Kings county, in the State of New York, have invented certain new and useful Improvements relating to Button-Hole Sewin g-Machines, of which the following is aspecification.

I obtain the required motion by very simple I mechanism. The same machine may be used and stillanother cam to give the proper longitudinal feed.

The accompanying drawings form a part of this specification, and represent what I consider the best means of carrying out the invention.

Figure I is a plan view of a sewing-machine having my invention applied thereto, with the goose-neck and its connections removed. Fig. 2 is a side view of the same, with a portion broken away. Fig. 3 represents a section through a portion on line :1 y in Fig. 1. Fig. 41s a section on line 2 z in Fig. 1.

Similar letters of reference indicate like parts in all the figures.

A is the fixed frame of the sewing-machine, which may be of cast-iron. I have in my experiments used the style and size known as Wheeler & Wilson, No. 7

It will be understood that the machine has all the parts for properly operating the needle and hook, with the respective threads for each.

B is the driving-shaft. I provide it with a worm, B, and beveledgear wheel B, by which my attachment is operated.

The garment is previously prepared by cutting the button-holes as plain slits in the fabric, and I clamp the fabric for each buttonhole successively between plates, which, having a sufficient aperture at and around the button-hole, effect the feeding, while the needle reciprocates in a uniform line, as in common sewingmachines. The clamp is marked 1?, and is opened and closed by turning a le ver, 0. The clamp is fixed on a slide, N, which is capable of moving longitudinally in a groove formed in a carriage, M. Both are operated by cams.

The worm B engages with a worm-wheel, D, on anupright shaft, D, which carries a disk provided with a heart-shaped grooved cam, D which is engaged by a pin, M and by its slow rotation gives to the carriage M the gradually-sliding motion required to shift the clamp P and the fabric carried thereby lengthwise of the button-hole the required amount for each stitch.

The beveled-gear wheel 13? engages with a larger beveled-gear'wheel, E, on an upright shaft, E, which carries at its upper end a cam, E This cam turns once for every two reciprooations of the needle. (Not shown.)

G is a lever, peculiarly formed and operated. It has no fixed center. A transverse slot, g, formed in the arm as serves as a guide longitudinally by fitting upon a pin, f, fixed in the lever G. The cam E acts against the side of/ the lever immediately adjacent to this slot, and at each revolution moves said lever. At one end is swiveled a bearing-piece, H, which acts against a shoulder, N, on the slide N, and moves the slide with the connected fabric in opposition to the stress of a spring, I, mounted in the carriage M, which spring, as the cam E retires, induces the return motion of the slide. This reciprocation of the slide N at each two rcciprocations of the needle induces the proper movements of the fabric relatively to the'needle to produce a button-hole stitch.

At the other end of the lever G, I fix a bearing-piece, J, which is adjustable by means of a screw, j, and presses against the cam D on the shaft D. This cam is simple in form. It

has two oifsets. When these, by the slow rotation of the shaft D, successively pass the bearing-piece J they change the position of the latter. It follows that, considering the bearing-piece J as the fulcrum of the lever Gr,

it is a shifting fulcrum. It stays a while in one position, and thus conditioned the shifting motion of the goods due to the action of the cam E produces the required stitch along one side of the button hole. Then, when the end of the button-hole is reached, the offset in the cam D changes the position of the fulcrum Y J, and consequently induces the lever G to reciprocate in a new position-t. 0., a position in which the slideN is loeated--so as to bring the stitch on the other side of the button-hole during the return motion.

I make the cam E of such shape as will give more motion to the lever G than is ordinarily required, and control the amount of motion by a setscrew, K, which is tapped through the lower part'of the lever G, and at each reciprocation comes to rest against a boss, A,'forming a part of the fixed framework of the machine. It follows that the cam E thrusts the adjacent surface of the lever G always to a uniform point; but as the cam E retires the lever Gr does not follow it to the full extent allowed by the cam, but is arrested at a certain point by the set-screw K. This varies the extent of the movement of the slide N, and consequently the length of the lateral stitch.

The adjustment of the bearing-piece J is only necessary in first setting the machine at Work on any given size of button-hole, and to compensate for subsequent wear. The parts are little liable to wear or derangement.

Nearly or quite all the ordinary improvements and modifications may be applied" to the other parts of the machine in connection with my attachment.

I claim as my invention- The lever G, having steadying-pin f, arm as, having the slot g, cams E D2 D carriage M, slide N and its attachments O P, the shafts D E and their operating mechanism, and the spring I, all combined and operating as and for the purposes set forth.

In testimony whereof I have hereunto set my hand this 20th day of October, 1879, in the presence of two subscribing witnesses.

JOHN H. BROWN.

Witnesses:

W. OoL-BoRNE BROOKES, THOMAS D. S'rETsoN. 

